Partager

Compression bi-étagée avec injection de vapeur : étude d’une solution inexploitée pour les applications de surpression au CO2 pour le froid dans les supermarchés.

Two-stage compression with vapor injection: a study on a disregarded solution in CO2 booster applications for supermarket refrigeration.

Numéro : 2544

Auteurs : VEGA J., DAVILA C., LEMORT V.

Résumé

CO2 refrigeration has been largely implemented, especially in supermarket applications. Nonetheless, one solution that has been often disregarded in these applications has been the inclusion of TwoStage compression cycles including vapour injection. Available literature has not yet compared these solutions with Booster applications. Thus, this paper presents the modelling of two solutions of TwoStage vapour injection cycles in a Booster configuration application: Flash Tank vapour injection (FTVI) and Subcooled Vapour injection (SCVI). The adopted methodology is more focused on the thermodynamic cycle rather than detailed components modelling. An analysis of the optimal displacement ratio between compression stages has been conducted, exploring the influence of this parameter on the optimum transcritical high pressure. It has been found that optimal high pressure does not vary considerably when changing displacement ratio and that, for different operating points, FTVI optimum ratio lays around 0.95, while for SCVI, sits around 0.85. The FTVI and SCVI cycles performances are compared with models of Basic Booster Cycle, Parallel Compression, Gas Ejector assisted Parallel compression and Liquid Ejector assisted Parallel Compression architectures. COP comparison for different ambient temperatures is performed, with each system working close to its optimum. The most competitive TwoStage solution is the SCVI cycle, performing similarly to the the Gas Ejector cycle at high temperatures conditions, reaching a 21.5% against 23% COP increase, respectively, over the basic Booster at 44 °C ambient temperature. A sensitivity analysis is carried for different hypotheses. It is found that assuming higher compressor efficiency in all systems increases the comparative advantage of the TwoStage cycles. In an ideal scenario, SCOP is computed for the climates of Helsinki, Strasbourg and Athens. Results suggest that the ejector cycles still are the best overall performing. However, this scenario assumes that Parallel Compression is always active, which is not often possible in subcritical operation. A second ”realistic” scenario is defined, giving FTVI and SCVI cycles energy savings with respect to the basic Booster an advantage of 4.08% and 5.35% against 3.41% of the Gas Ejector system.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Two-stage compression with vapor injection: a study on a disregarded solution in CO2 booster applications for supermarket refrigeration.
  • Identifiant de la fiche : 30028549
  • Langues : Anglais
  • Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 05/2021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

Liens


Voir d'autres communications du même compte rendu (184)
Voir le compte rendu de la conférence

Indexation